…freeing memory

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#### Description <!-- Describe your changes in detail --> as per @miconda's suggestion, added memory checks

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/2792

-- Commit Summary --

* nats: make sure pkg & shm memory is allocated; check pointers before freeing memory

-- File Changes --

M src/modules/nats/nats_mod.c (69)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2792.patch https://github.com/kamailio/kamailio/pull/2792.diff